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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-10-2013, 07:49 PM   #1
TArse
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Losing my mind. Lean condition.

I have been getting p1092 for about a week and I've checked the UIB, LIB, disa, and cleaned the icv.

I've noticed that on cold starts my car is jumpy under acceleration which has led me to believe that there is a leak somewhere in my secondary air system.

Today I pulled a code p0492(?) that said I had low air flow from my secondary air pump on bank 2. I'm not sure if this confirmed my idea of the leak(?) being somewhere within the secondary air pump system.

In a couple hours I am going to start my car and see if the air pump turns on. Earlier today I checked the check valve that is bolted onto the motor and it was relatively clean on the inside, as well as the hose that runs to the valve from the pump. Now the small hose that runs to the rear of the motor was very stiff, I could not check the valve it goes to behind the intake manifold just because I could not reach it.


So after all that I have no idea what it could be unless that tiny vac line off the check valve is causing my lean condition. If it is (or is my SAP is failing) I plan on removing that system because I have no cats.

If anyone can chime in and give me things to check or insight I would really appreciate it.


(I'm sure I've left some things I've done out of this post)
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Old 04-10-2013, 09:18 PM   #2
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I've read a really good troubleshooting guide for the SAP on Bavauto website.
I don't remember the steps but that should help with this problem.
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Old 04-11-2013, 02:17 PM   #3
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I've read a really good troubleshooting guide for the SAP on Bavauto website.
I don't remember the steps but that should help with this problem.
I will look it up in a minute. I just checked to see is my sap is working and it is.
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Old 04-12-2013, 09:46 PM   #4
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Small update.
150 mi and no ses, dunno what's going on, hopefully my ses light didn't burn out haha
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Old 04-13-2013, 05:09 AM   #5
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500ft down the road this morning and I'm ses came on
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Old 04-13-2013, 08:03 AM   #6
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My fix for the P0492 code ended up being the hose behind the manifold (#4 in the diagram). It had comepletely deteriorated and was no longer connected to the the sensor/valve (#5 in the diagram).

And if you have the same issue as me, I would suggest being careful if you need to remove the hose from sensor/valve (#5) cause I broke the nipple for the hose trying to remove it.
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Old 04-13-2013, 09:53 AM   #7
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I tried to get where that hose was going being the manifold but I couldn't get back there and I definitely couldn't see anything back there. Any tips besides removing the cabin filter, which I did

Last edited by TArse; 04-13-2013 at 12:22 PM.
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Old 04-13-2013, 09:55 AM   #8
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Also I keep getting a lean code on my bank 2 peer cat. Could the SAI system be contributing to that?
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Old 04-13-2013, 10:54 AM   #9
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It's quite common that one issue causes other codes to appear and vacuum leaks typically cause lean conditions.
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Old 04-13-2013, 01:33 PM   #10
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Anyone know an easy way to access the sap vac hose
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Old 04-13-2013, 06:49 PM   #11
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Remove the cabin filter, cabin filter housing, and engine covers. Then you'll be able to trace the hose along the back of the manifold with the O2 sensor wires.
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Old 04-14-2013, 05:19 AM   #12
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I traced it all the way. I tried to look over it and it seemed fine. I think in going to be replacing it and the 2 other hoses connected behind the manifold for safe measure
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Old 04-15-2013, 12:09 PM   #13
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This am I got peake code 7c(table 19) "disa control". The disa appears to seal good and is just under a year old. Hmm. Cleared it when I got to work, will report back later

Edit - Checked and I forgot to plug the diss in

Last edited by TArse; 11-29-2013 at 04:30 AM.
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Old 04-16-2013, 12:57 PM   #14
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Replacing the gasket that goes between the SAP valve and motor today and ordering a disa ring.
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Old 11-29-2013, 04:30 AM   #15
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Losing my mind. Lean condition.

Thread revival

Over the summer there were no codes!! Yay! Now it's getting cold, like ~25°F. This morning my car decided to spit out a slew of codes. The codes I got per Peake reader.

Table 19
A8 - coolant thermostat jammed open (ordering new one as soon as I get home)
Eb - precat fuel trim system cylinders 1-3
Ec - precat fuel trim system cylinders 4-6
F5 - secondary air system flow too low cylinders 1-3
F6 - secondary air system flow too low cylinders 4-6

Well it seems my problem wasn't fixed and has seriously evolved. I won't have a chance to start digging until next weekend. From what I'm gathering I have a leak in the Secondary air system somewhere (please correct me if I'm wrong for assuming).




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Old 11-29-2013, 04:31 AM   #16
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Losing my mind. Lean condition.

Double post
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Old 11-29-2013, 05:33 AM   #17
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Did you check the hose leaving the SAP to back of intake manifold? Part of it is brittle plastic and cracks quite often, especially after other work has been done like 02 sensors or vcg. You can remove cabin air filter housing and look back there pretty easily. That it's an issue after you're warmed up and the sap pump is off makes me think that it might well be that hose.

I just ran a vac line all the way back without buying that hard plastic section of hose...others had done it and so far I'm still good...I used a pretty strong hose--fuel line, not just a thin walled vac line.

hth...good luck!
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Old 11-30-2013, 12:19 AM   #18
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Did you check the hose leaving the SAP to back of intake manifold? Part of it is brittle plastic and cracks quite often, especially after other work has been done like 02 sensors or vcg. You can remove cabin air filter housing and look back there pretty easily. That it's an issue after you're warmed up and the sap pump is off makes me think that it might well be that hose.

I just ran a vac line all the way back without buying that hard plastic section of hose...others had done it and so far I'm still good...I used a pretty strong hose--fuel line, not just a thin walled vac line.

hth...good luck!
The small hose on the valve right?
I'll check it as soon as I get home today.


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Old 11-30-2013, 03:34 AM   #19
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The small hose on the valve right?
I'll check it as soon as I get home today.


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Yep...it starts as a vac line and attaches to a hard plastic line...tucked in amidst the wires from the 02 sensors.

My vac line had cracked just at the valve...I just dabbed rtv on it and it held fine for a while until I got to a proper repair.
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Old 11-30-2013, 05:09 PM   #20
TArse
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Losing my mind. Lean condition.

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Yep...it starts as a vac line and attaches to a hard plastic line...tucked in amidst the wires from the 02 sensors.

My vac line had cracked just at the valve...I just dabbed rtv on it and it held fine for a while until I got to a proper repair.
I checked over the line this am and It seemed fine. I will replace it this week just to be sure.


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